This is unhelpful, but... I just don't look at the news. If something actually important happens, I'll hear about it indirectly and go look it up if I care, but I've found that not being tapped into the news (and especially political news) all day every day does wonders for my mental health.

As others have said, you have to think critically about every piece of news you read. Ask yourself what the opposite side on a story might think, or look for an alternative opinion. If you're reading an article in The Economist, read an article in Le Monde Diplomatique on the same subject. If you're reading something about Russia in the Washington Post, read an article in RT on the same topic. Think critically, and the truth is likely somewhere between the two opposing points.

International mass media is a form of soft power for countries to exert influence. It's not a conspiracy it's a tool available to governments which is why you have the BBC, CGTN, RT, PressTV, CBC, etc. That the mass media in the USA is mostly private doesn't change that fact and make it more independent, because the USA is essentially an ogliopoly.

Lemmygrad.ml

What specifically do you want lemmy mods to "stop?" What kind of lies are they spreading? What do you consider disinformation. Complaining that your world view isn't being catered to is a lot less useful then pointing out specific things you find sus.